<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 头部警告区 -->
      <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false">
      </el-alert>

      <!-- 选择商品分类区 -->
      <el-row class="col_cat">
        <el-col>
          <span>选择商品分类</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader v-model="selectedCateKeys" :options="cateList" @change="handleChanged" expand-trigger="hover"
            :props="cateProps" clearable></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数按钮 -->
          <el-button @click="addDialogVisible = true" type="primary" size="size" :disabled="isBtnDisabled">添加参数
          </el-button>
          <!-- 添加动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable
                  @close="handleClose(index,scope.row)">
                  {{item}}
                </el-tag>
                <!-- 文本输入框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                  ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button @click="showEditDialog(scope.row.attr_id)" size="mini" type="primary" icon="el-icon-edit">编辑
                </el-button>
                <el-button size="mini" type="danger" @click="deleteParams(scope.row.attr_id)" icon="el-icon-delete">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性按钮 -->
          <el-button @click="addDialogVisible = true" type="primary" size="size" :disabled="isBtnDisabled">添加属性
          </el-button>
          <!-- 添加静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable
                  @close="handleClose(index,scope.row)">
                  {{item}}
                </el-tag>
                <!-- 文本输入框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                  ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"></el-input>
                <!-- 按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button @click="showEditDialog(scope.row.attr_id)" size="mini" type="primary" icon="el-icon-edit">编辑
                </el-button>
                <el-button @click="deleteParams(scope.row.attr_id)" size="mini" type="danger" icon="el-icon-delete">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>

    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">

      <!-- 表单 -->
      <el-form ref="addFormRef" :rules="addFormRules" :model="addForm" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>

      <!-- 底部 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>

    </el-dialog>

    <!-- 修改参数对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">

      <!-- 表单 -->
      <el-form ref="editFormRef" :rules="editFormRules" :model="editForm" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>

      <!-- 底部 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>

    </el-dialog>
  </div>
</template>
<script>
export default {
  data () {
    return {
      cateList: [],
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedCateKeys: [],
      activeName: 'many',
      manyTableData: [],
      onlyTableData: [],
      addDialogVisible: false,
      addForm: {
        attr_name: ''
      },
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      editDialogVisible: false,
      editForm: {},
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      // console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.cateList = res.data
      // console.log(this.cateList)
      // console.log(res.data)
    },
    // 级联选择框选中项变化 会触发这个函数
    handleChanged () {
      this.getParamsData()
    },
    // tab页签点击处理函数
    handleTabClick () {
      // console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数列表数据
    async getParamsData () {
      // console.log(this.selectedCateKeys)
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      // console.log(this.selectedCateKeys)
      // 根据所选分类id和当前所处的面板 获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      // console.log(res)
      // console.log(res.data)
      // 把数据中的每一项用空格分隔成数组（数据获取完就处理或者使用时再处理）
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        item.inputValue = ''
      })
      // 判断获取的数据从而挂载到不同表格
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮 添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
      })
    },
    // 点击按钮 展示修改对话框
    async showEditDialog (attrId) {
      // 查询当前参数信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
        params: { attr_sel: this.activeName }
      })
      // console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改表单
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮 修改参数信息
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        )
        // console.log(res)
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 删除参数
    async deleteParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 用户取消删除操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('用户已取消删除操作')
      }
      // 确定删除
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      // 删除成功
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    // 文本框失去焦点或者摁下回车都会触发
    handleInputConfirm (row) {
      // console.log('ok')
      // 去空格后长度仍为0 说明不合法 需要清空文本框
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return 则说明输入了内容 需要进行下一步处理
      // 新加的显示在页面
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 发请求保存新加的参数可选项
      this.saveAttrsVal(row)
    },
    // 保存添加的参数可选项(编辑提交参数)
    async saveAttrsVal (row) {
      // 发送请求 保存本次操作
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    },
    // 点击按钮 显示文本框
    showInput (row) {
      // 显示文本框
      row.inputVisible = true
      // 文本框自动获得焦点
      // 方法1
      // this.$nextTick(function() {
      //   const input = document.querySelector('.el-table input')
      //   input.focus()
      // })
      // 方法2
      // $nextTick方法作用 就是当页面上的元素被重新渲染后 才会执行回调函数的代码
      this.$nextTick(_ => {
        // 配置了ref=this.$refs.saveTagInput的组件
        // 组件里面有配置ref=input  就能找到对应的dom元素
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应参数可选项
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrsVal(row)
    }
  },
  computed: {
    // 如果按钮需要禁用返回true 不需要返回false
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的id
    cateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>
<style lang="less" scoped>
.col_cat {
  margin: 10px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 110px;
}
</style>